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Analog beam selection schemes of DFT-based hybrid beamforming multiuser systems

Han, Y; Jin, S; Zhang, J; Zhang, J; Wong, K-K; (2018) Analog beam selection schemes of DFT-based hybrid beamforming multiuser systems. In: The Proceedings of the 2017 23rd Asia-Pacific Conference on Communications (APCC). IEEE Green open access

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Abstract

This paper studies analog beam selection schemes of discrete Fourier transform (DFT) based hybrid beamforming systems. We first derive approximations of the achievable rates when maximum-ratio combining (MRC) receiver and maximum-ratio transmitting (MRT) precoder are used in the uplink and downlink, respectively. It is shown that the achievable rate of the hybrid beamforming system is improved with the increase of the number of radio frequency chains. Also, it is found that the orthogonality condition among the line-of-sight (LoS) paths from different users directly determines the interference cancellation capability of the MRC receiver or the MRT precoder. Based on our analytical results, we propose two novel DFT beam selection schemes, referred to as exhausted searching and per-user selection. Numerical results show that the first scheme achieves higher rate while the second one is a simple suboptimal strategy with low complexity, which is practically more attractive.

Type: Proceedings paper
Title: Analog beam selection schemes of DFT-based hybrid beamforming multiuser systems
Event: 2017 23rd Asia-Pacific Conference on Communications (APCC)
Location: Perth (WA), Australia
Dates: 11 December 2017 - 13 December 2017
ISBN-13: 978-1-7405-2390-5
Open access status: An open access version is available from UCL Discovery
DOI: 10.23919/APCC.2017.8304065
Publisher version: https://doi.org/10.23919/APCC.2017.8304065
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Array signal processing, Receivers, Uplink, Discrete Fourier transforms, Fading channels, Downlink, MIMO communication
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10055175
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